xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/leds/leds-bcm6328.yaml

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/leds-bcm6328.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: LEDs connected to Broadcom BCM6328 controller

maintainers:
  - Álvaro Fernández Rojas <noltari@gmail.com>

description: |
  This controller is present on BCM6318, BCM6328, BCM6362 and BCM63268.
  In these SoCs it's possible to control LEDs both as GPIOs or by hardware.
  However, on some devices there are Serial LEDs (LEDs connected to a 74x164
  controller), which can either be controlled by software (exporting the 74x164
  as spi-gpio. See
  Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml), or by hardware
  using this driver.
  Some of these Serial LEDs are hardware controlled (e.g. ethernet LEDs) and
  exporting the 74x164 as spi-gpio prevents those LEDs to be hardware
  controlled, so the only chance to keep them working is by using this driver.

  BCM6328 LED controller has a HWDIS register, which controls whether a LED
  should be controlled by a hardware signal instead of the MODE register value,
  with 0 meaning hardware control enabled and 1 hardware control disabled. This
  is usually 1:1 for hardware to LED signals, but through the activity/link
  registers you have some limited control over rerouting the LEDs (as
  explained later in brcm,link-signal-sources). Even if a LED is hardware
  controlled you are still able to make it blink or light it up if it isn't,
  but you can't turn it off if the hardware decides to light it up. For this
  reason, hardware controlled LEDs aren't registered as LED class devices.

  Each LED is represented as a sub-node of the brcm,bcm6328-leds device.

properties:
  compatible:
    const: brcm,bcm6328-leds

  reg:
    maxItems: 1

  brcm,serial-leds:
    type: boolean
    description: Enables Serial LEDs.

  brcm,serial-mux:
    type: boolean
    description: Enables Serial LEDs multiplexing.

  brcm,serial-clk-low:
    type: boolean
    description: Makes clock signal active low.

  brcm,serial-dat-low:
    type: boolean
    description: Makes data signal active low.

  brcm,serial-shift-inv:
    type: boolean
    description: Inverts Serial LEDs shift direction.

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

patternProperties:
  "@[a-f0-9]+$":
    type: object

    $ref: common.yaml#

    properties:
      reg:
        items:
          - maximum: 23
        description: LED pin number (only LEDs 0 to 23 are valid).

      active-low:
        type: boolean
        description: Makes LED active low.

      brcm,hardware-controlled:
        type: boolean
        description: Makes this LED hardware controlled.

      brcm,link-signal-sources:
        $ref: /schemas/types.yaml#/definitions/uint32-array
        minItems: 1
        maxItems: 4
        description: >
          An array of hardware link signal sources. Up to four link hardware
          signals can get muxed into these LEDs. Only valid for LEDs 0 to 7,
          where LED signals 0 to 3 may be muxed to LEDs 0 to 3, and signals 4 to
          7 may be muxed to LEDs 4 to 7. A signal can be muxed to more than one
          LED, and one LED can have more than one source signal.

      brcm,activity-signal-sources:
        $ref: /schemas/types.yaml#/definitions/uint32-array
        minItems: 1
        maxItems: 4
        description: >
          An array of hardware activity signal sources. Up to four activity
          hardware signals can get muxed into these LEDs. Only valid for LEDs 0
          to 7, where LED signals 0 to 3 may be muxed to LEDs 0 to 3, and
          signals 4 to 7 may be muxed to LEDs 4 to 7. A signal can be muxed to
          more than one LED, and one LED can have more than one source signal.

    required:
      - reg

    unevaluatedProperties: false

required:
  - reg
  - "#address-cells"
  - "#size-cells"

additionalProperties: false

examples:
  - |
    /* BCM6328 with 4 EPHY LEDs */
    led-controller@10000800 {
        compatible = "brcm,bcm6328-leds";
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x10000800 0x24>;

        alarm_red@2 {
            reg = <2>;
            active-low;
            label = "red:alarm";
        };

        inet_green@3 {
            reg = <3>;
            active-low;
            label = "green:inet";
        };

        power_green@4 {
            reg = <4>;
            active-low;
            label = "green:power";
            default-state = "on";
        };

        ephy0_spd@17 {
            reg = <17>;
            brcm,hardware-controlled;
        };

        ephy1_spd@18 {
            reg = <18>;
            brcm,hardware-controlled;
        };

        ephy2_spd@19 {
            reg = <19>;
            brcm,hardware-controlled;
        };

        ephy3_spd@20 {
            reg = <20>;
            brcm,hardware-controlled;
        };
    };
  - |
    /* BCM63268 with Serial/GPHY0 LEDs */
    led-controller@10001900 {
        compatible = "brcm,bcm6328-leds";
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x10001900 0x24>;
        brcm,serial-leds;
        brcm,serial-dat-low;
        brcm,serial-shift-inv;

        gphy0_spd0@0 {
            reg = <0>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <0>;
        };

        gphy0_spd1@1 {
            reg = <1>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <1>;
        };

        inet_red@2 {
            reg = <2>;
            active-low;
            label = "red:inet";
        };

        dsl_green@3 {
            reg = <3>;
            active-low;
            label = "green:dsl";
        };

        usb_green@4 {
            reg = <4>;
            active-low;
            label = "green:usb";
        };

        wps_green@7 {
            reg = <7>;
            active-low;
            label = "green:wps";
        };

        inet_green@8 {
            reg = <8>;
            active-low;
            label = "green:inet";
        };

        ephy0_act@9 {
            reg = <9>;
            brcm,hardware-controlled;
        };

        ephy1_act@10 {
            reg = <10>;
            brcm,hardware-controlled;
        };

        ephy2_act@11 {
            reg = <11>;
            brcm,hardware-controlled;
        };

        gphy0_act@12 {
            reg = <12>;
            brcm,hardware-controlled;
        };

        ephy0_spd@13 {
            reg = <13>;
            brcm,hardware-controlled;
        };

        ephy1_spd@14 {
            reg = <14>;
            brcm,hardware-controlled;
        };

        ephy2_spd@15 {
            reg = <15>;
            brcm,hardware-controlled;
        };

        power_green@20 {
            reg = <20>;
            active-low;
            label = "green:power";
            default-state = "on";
        };
    };
  - |
    /* BCM6362 with 1 LED for each EPHY */
    led-controller@10001900 {
        compatible = "brcm,bcm6328-leds";
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x10001900 0x24>;

        usb@0 {
            reg = <0>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <0>;
            brcm,activity-signal-sources = <0>;
            /* USB link/activity routed to USB LED */
        };

        inet@1 {
            reg = <1>;
            brcm,hardware-controlled;
            brcm,activity-signal-sources = <1>;
            /* INET activity routed to INET LED */
        };

        ephy0@4 {
            reg = <4>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <4>;
            /* EPHY0 link routed to EPHY0 LED */
        };

        ephy1@5 {
            reg = <5>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <5>;
            /* EPHY1 link routed to EPHY1 LED */
        };

        ephy2@6 {
            reg = <6>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <6>;
            /* EPHY2 link routed to EPHY2 LED */
        };

        ephy3@7 {
            reg = <7>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <7>;
            /* EPHY3 link routed to EPHY3 LED */
        };

        power_green@20 {
            reg = <20>;
            active-low;
            label = "green:power";
            default-state = "on";
        };
    };
  - |
    /* BCM6362 with 1 LED for all EPHYs */
    led-controller@10001900 {
        compatible = "brcm,bcm6328-leds";
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x10001900 0x24>;

        usb@0 {
            reg = <0>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <0 1>;
            brcm,activity-signal-sources = <0 1>;
            /* USB/INET link/activity routed to USB LED */
        };

        ephy@4 {
            reg = <4>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <4 5 6 7>;
            /* EPHY0/1/2/3 link routed to EPHY0 LED */
        };

        power_green@20 {
            reg = <20>;
            active-low;
            label = "green:power";
            default-state = "on";
        };
    };
  - |
    /* BCM6362 with EPHY LEDs swapped */
    led-controller@10001900 {
        compatible = "brcm,bcm6328-leds";
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x10001900 0x24>;

        usb@0 {
            reg = <0>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <0>;
            brcm,activity-signal-sources = <0 1>;
            /* USB link/act and INET act routed to USB LED */
        };

        ephy0@4 {
            reg = <4>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <7>;
            /* EPHY3 link routed to EPHY0 LED */
        };

        ephy1@5 {
            reg = <5>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <6>;
            /* EPHY2 link routed to EPHY1 LED */
        };

        ephy2@6 {
            reg = <6>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <5>;
            /* EPHY1 link routed to EPHY2 LED */
        };

        ephy3@7 {
            reg = <7>;
            brcm,hardware-controlled;
            brcm,link-signal-sources = <4>;
            /* EPHY0 link routed to EPHY3 LED */
        };

        power_green@20 {
            reg = <20>;
            active-low;
            label = "green:power";
            default-state = "on";
        };
    };